Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d325108d73bfb8c…

MALICIOUS

PDF

79.2 KB Created: 2021-04-18 09:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5d70a975958827aa24180da9e3a93b8d SHA-1: b5d54cac28896111c89f805621c0d20828dcd57c SHA-256: 3d325108d73bfb8c7f03b6b9e9b63c1a4c792b73d9533a138419b8380a46f5c5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting it's a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains keywords that appear to be part of a lure, aiming to direct the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=apollo+twin+price+uk In PDF document text
    • https://cdn.sqhk.co/lukavago/ghngfgi/40016525762.pdfIn PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/wovepax-wimoriragefinax-lopavusete-bokavezofox.pdfIn PDF document text
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/fugigu.pdfIn PDF document text
    • https://xajapeni.weebly.com/uploads/1/3/4/3/134341300/57048efa648.pdfIn PDF document text
    • https://ruwefenoref.weebly.com/uploads/1/3/0/7/130739117/roxusome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_601b7508345fa.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/Cyidhd9/30722464184.pdfIn PDF document text
    • https://foduzivanikatik.weebly.com/uploads/1/3/4/4/134492938/2687297.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/thffMgg/sewagul.pdfIn PDF document text
    • https://mopepeserowote.weebly.com/uploads/1/3/4/6/134621402/bunato.pdfIn PDF document text
    • https://gutirupivib.weebly.com/uploads/1/3/4/7/134768574/8794476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_6067f769c7cf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443602/normal_5fe461f4bf05c.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jcjgc7d/ridesajamu.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/W1STig2/radiant_heat_manifolds_diy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5fdfa2b41367d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazomo/writing_arguments_a_rhetoric_with_readings_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/omron_body_fat_monitor_and_scale_accuracy.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/lsiibbu07_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4320d6a-50b2-4e50-b789-b1412f3c393a/mapovifazejizatujexeviza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cae0fc-b180-4be1-8022-6af5c6963045/bipaxezesabipum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5c321d-9d29-4df3-9040-c0790cae9633/24111799989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24336e42-74f3-4e33-93f3-6d9fc937b816/65696731312.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/lexegedazagugozozonibiz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 4684 bytes
SHA-256: 04a198283b15271565bc3500cf8e02af2534652f4c3c6321a83183522c9c0be0
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 11476 bytes
SHA-256: 5266944dcf65329a18053b86c7f5ba7259ddfe9961c04666c13b250bd9045072